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`var bar = new pulumi.Config("foo").require("bar");`

Unless "foo" is the name of the project, in which case, you would omit the parameter to `new Config()`.

its actually this
i was trying to generalize

```config:
  aws:region: us-west-2```
so i was trying to create a resource which is region specific so instead of hardcoding i am trying to use the region var

<https://www.pulumi.com/docs/intro/concepts/config/#code>

tenwit has the correct pattern there though, so following that and replacing `foo` with `aws` and `bar` with `region` gets you what you want.

The aws provider should grab that config without you needing to worry about it though. The `aws:region` config value is used automatically.

I tried to add new variable in pulumi.dev.yaml

```config:
  aws:region: us-west-2
  ecr:env: dev```
when i try to access it throws error

```var env = new pulumi.Config("ecr").require("env");
const ecr = ecr("registry/${env}/alpine");```

expecting
```const ecr = ecr("registry/dev/alpine");```

```    error: 1 error occurred:
        * error creating ECR repository: InvalidParameterException: Invalid parameter at 'repositoryName' failed to satisfy constraint: 'must satisfy regular expression '(?:[a-z0-9]+(?:[._-][a-z0-9]+)*/)*[a-z0-9]+(?:[._-][a-z0-9]+)*''```

oh so this works as expected
````registry/${env}/alpine````
what is the difference between " and ` ?

<https://basarat.gitbook.io/typescript/future-javascript/template-strings>

(This is how strings are interpolated in typescript)